Provide more secure handling of zoombox in hist painter
Provide more secure handling of zoombox in hist painter

While it handled in static variable, initialize it
and verify if it there when access it.
olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root